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Part 2 Requirements
5 Safety Objective
The instrument landing system shall provide an accurate and uncorrupted source of guidance to aircraft (1347).
6 Equipment
NOTE: Throughout this requirement, all references to signal voltages are the voltages measured at the aerial when terminated with 50 .. When calibrating the equipment, due allowance must be made for cable losses.
6.1 Automatic Scanning : Ability to bypass up to 5 channels (1348)
6.2 Frequency range:
108.00 - 112.00 MHz (1349)
6.3 Frequency tolerance: ± 0.005% (1350)
6.4 Channel spacing: 50 kHz (1351)
6.5 IF bandwidth:
The 3dB bandwidth shall be between ±10 and ±15 kHz (1352). The exact figure shall be stated as it is required for analysis calculations (1353).
6.6 Receiver sensitivity:
2μV for 10dB (signal + noise)/noise ratio at 50% Mod AM or FM deviation 30% of IF bandwidth (1354).
6.7 Modulation detector:
The standard detector shall be for amplitude modulation (1355). For normal monitoring this detector shall provide the output to the audio storage device (1620).
6.8 Recommendation. The receiver should also be able to detect frequency modulation (1621).
NOTE: A receiver which automatically selects the correct detector for the modulation mode may be used. If this is used, the stored records should show the type of detector in use at the time of recording.
6.9 Audio bandwidth:
The minimum 3dB bandwidth of the receiver and recording equipment shall be 300 to 3,400 Hz (1356).
6.10 Spurious responses
The receiver shall provide adequate immunity to interference from two-signal third order intermodulation products caused by signals outside the band being examined (1357). This may be achieved by using a receiver which meets the requirements of ICAO Annex 10 Paragraph 3.1.4
6.11 Dynamic range
6.11.1 The receiver shall measure signal strengths in the range 2μV to 100μV (1358).
6.11.2 The receiver shall be capable of detecting modulation when the signal strength is in the range 2μV to 1000μV (1359)
6.12 Interval between successive scans
Between 1 and 2 minutes when no modulation is being recorded (1360). This figure
shall be quoted since it will be required for the analysis of data (1361).
In other cases the total scan time will be determined by the recording time.
6.13 Scanning dwell time on each channel
For signals greater than Threshold 1 but less than Threshold 2: The receiver shall dwell on the channel long enough to allow the time, channel number and signal strength to be logged (1362).
6.13.1 For signals greater than Threshold 2: The receiver shall dwell on the channel long enough to allow the time, channel number and signal strength to be logged, and for demodulated audio signals to be recorded (1363).
6.14 Audio Recording duration
When a signal exceeds threshold 2, the demodulated audio signal shall be recorded for a continuous period of approximately 20 seconds (1364).
NOTE: To save recording space, if 10 successive scans have found the same channel with a signal exceeding Threshold 2, modulation recording of that channel may be terminated and only the signal strength need be logged.
6.15 Channels to be examined at each scan:
Initially, all except the operational Localiser frequency or frequencies (1365).
NOTE: If a continuous carrier is detected on one or more of the channels being examined, the scanning may step over those channels provided that the presence of the carrier on that channel has been recorded.
6.16 Operational Channel monitoring
If the equipment can also record interference events on the operational channel.
Details shall be provided of:
a) The mask used to remove the ILS signal (1366).
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本文链接地址：CAP 670 Air Traffic Services Safety Requirements 2(41)
